snapshot of https://github.com/zulip/zulip.git @ 48c69911c7dd4e03b20552eb3bd77ad8151c1357 (2026-09-15)

web/tests/message_util.test.cjs

@@ -0,0 +1,84 @@
+"use strict";
+
+const assert = require("node:assert/strict");
+
+const {mock_esm, zrequire} = require("./lib/namespace.cjs");
+const {run_test, noop} = require("./lib/test.cjs");
+
+const channel = mock_esm("../src/channel");
+
+const message_util = zrequire("message_util");
+
+let reported_ids = [];
+function record_last_message_id(id) {
+    reported_ids.push(id);
+}
+
+function test(label, f) {
+    run_test(label, (helpers) => {
+        reported_ids = [];
+        f(helpers);
+    });
+}
+
+test("get_last_message_id_in_narrow builds the request from the narrow", () => {
+    let requested_opts;
+    channel.get = (opts) => {
+        requested_opts = opts;
+    };
+
+    const narrow = [
+        {operator: "channel", operand: 5},
+        {operator: "topic", operand: "topic"},
+    ];
+    message_util.get_last_message_id_in_narrow(narrow, noop, {allow_empty_topic_name: true});
+
+    assert.equal(requested_opts.url, "/json/messages");
+    assert.deepEqual(requested_opts.data, {
+        narrow: JSON.stringify(narrow),
+        anchor: "newest",
+        num_before: 1,
+        num_after: 0,
+        allow_empty_topic_name: true,
+    });
+});
+
+test("get_last_message_id_in_narrow reports the last message id on success", () => {
+    channel.get = (opts) => {
+        opts.success({messages: [{id: 987}]});
+    };
+
+    message_util.get_last_message_id_in_narrow(
+        [{operator: "dm", operand: [4]}],
+        record_last_message_id,
+    );
+
+    assert.deepEqual(reported_ids, [987]);
+});
+
+test("get_last_message_id_in_narrow ignores an empty result", () => {
+    channel.get = (opts) => {
+        opts.success({messages: []});
+    };
+
+    message_util.get_last_message_id_in_narrow(
+        [{operator: "dm", operand: [4]}],
+        record_last_message_id,
+    );
+
+    assert.deepEqual(reported_ids, []);
+});
+
+test("get_last_message_id_in_narrow ignores errors", () => {
+    channel.get = (opts) => {
+        opts.error();
+    };
+
+    // Should not throw or report a message id.
+    message_util.get_last_message_id_in_narrow(
+        [{operator: "dm", operand: [4]}],
+        record_last_message_id,
+    );
+
+    assert.deepEqual(reported_ids, []);
+});